1. J. F. Traub and H. Wozniakowski, A General Theory of Optimal Algorithms, Academic Press, New York (1982).
2. N. P. Korneichuk, “On approximation of convolutions of periodic functions,” in: Problems of Analysis and Approximations [in Russian], Institute of Mathematics, Ukrainian Academy of Sciences, Kiev (1989), pp. 76–80.
3. M. Shabozov, “On the recovery of solutions of Neuman’s boundary-value problem,” East. J. Approx., 2, No. 3, 369–379 (1996).
4. S. Pereverzev, Optimization of Methods for Approximate Solution of Operator Equations, Nova, New York (1996).
5. R. Plato and G. Vainikko, “On the regularization of projection methods for solving ill-posed problems,” Numer. Math., 57, 63–70 (1990).